Improved Adhesion of Nafion™-Coated Separator to Water-Processable LiNi_0.5Mn_1.5O₄ Electrodes

• Main Authors: Laura Malavolta, Antonio Terella, Francesca De Giorgio, Catia Arbizzani
• Format: Article
• Language: English
• Published: MDPI AG 2020-05-01
• Series: Batteries
• Subjects: modified separators; Nafion™ layer; aqueous binder; LiNi_0.5Mn_1.5O₄
• Online Access: https://www.mdpi.com/2313-0105/6/2/28
• ISSN: 2313-0105

The adhesion between electrode and separator is a key feature in cell assembly. Nafion™-coated separators for water-processed LiNi_0.5Mn_1.5O₄ (LNMO) electrodes are here proposed as an alternative to the polyolefin separators. Specifically, polyolefin separators are modified with Nafion™ solutions and their adhesion to high-potential LNMO electrodes is investigated. The physicochemical properties of the Nafion™-coated separator and its electrochemical performance in Li/LNMO cells are discussed and compared to those obtained with polyolefin Celgard^® (Charlotte, NC, USA) PP2075 separator. Improved adhesion and cycling stability, which could be further enhanced by a mild lamination process, were demonstrated with a thin layer of Nafion™ (0.1 mg cm⁻²).